HI Bernd,
I hope people find your thread at the right time in their practice. To me it is a great account. Also: I have sat with this person [2] and felt your review was balanced; you reflected on yourself candidly and with humor. So useful. I do not read you as insulting, and I also agree that there has been devaluing others; for me that sincere detection of devaluing speech of others is not to be dismissed. (For the theravadans, demoting others is also contraindicated in AN 5.159, item 5 of 5.)
Anyway, I think leaving retreat/teacher with a balanced understanding of the opportunity and the teacher is a great indiction of really pulling the teaching into oneself to actually investigate the practice (including not consuming a practice harmful to oneself, even if that's not the intention at all of the practice teacher).
When this sort of automony (without self grandosity nor promotion nor importance) occurs I think this is excellent: A person is begining to trust that, hard/messy as it may be, the only person who can do the work is oneself. [1]
Building a raft for oneself, we investigate it thoroughly based on prior knowledge of other rafts; if we trust someone elses raft, okay, but we may end up swimming back to shore again and again (analogy).
(...) didn't work for me, then left early. Next step trying more Karuna.
Two thumbs up. If I had more than two thumbs I'd raise them, too.
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[1] We can become better at finding teachers more in line with what we determines we need. What you've described here and elsewhere is (to me) not the flightiness that sometimes happens when one is new to the practice. To me, what you've described is the heart of taking the practice in very sincerely and starting to see what/who/how doesn't work for your practice at the moment, using own mind to say, "I'll try something else, because opportunities/time is limited and this other thing is just contrary at the moment." I don't think you're describing at all the gratifying-hunt for a pleasing teacher, merely you're acting on what is not effective for you at the moment, and importantly you're relying on what you have done so far to make this own-rafting-building step. It makes it a little more likely to find those raft-builders you can learn from/benefit with, too.
[2] I also heard research knowlege there of word etmologies and interesting histories. For me, at my time, then rich-in-a-jhanic practice with calm-content mind, the lengthy lectures were, from a historical point of view, very rich and interesting to me, suitable to a mind soaked in sukkha and listening. I opted at that time to not have interviews.